This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A141032 #19 Sep 08 2022 08:45:35
%S A141032 0,4,68,1092,17476,279620,4473924,71582788,1145324612,18325193796,
%T A141032 293203100740,4691249611844,75059993789508,1200959900632132,
%U A141032 19215358410114116,307445734561825860,4919131752989213764,78706108047827420228,1259297728765238723652
%N A141032 a(n) = 4*(16^n-1)/15.
%C A141032 The sequence of last digits, a(n) mod 10, is periodic with period length 5: repeat 0, 4, 8, 2, 6.
%H A141032 Vincenzo Librandi, <a href="/A141032/b141032.txt">Table of n, a(n) for n = 0..200</a>
%H A141032 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (17,-16)
%F A141032 a(n) = (A141060(n)-3)/10.
%F A141032 a(n) = 16*a(n-1)+4.
%F A141032 a(n) = 4*A131865(n-1).
%F A141032 a(n+1)-a(n) = A013709(n).
%F A141032 G.f.: 4*x / ( (16*x-1)*(x-1) ). - _R. J. Mathar_, Jul 02 2011
%p A141032 A141032:=n->4*(16^n-1)/15; seq(A141032(n), n=0..30); # _Wesley Ivan Hurt_, Mar 26 2014
%t A141032 s=0;lst={s};Do[s+=2^n;AppendTo[lst, s], {n, 2, 5!, 4}];lst (* _Vladimir Joseph Stephan Orlovsky_, Nov 07 2008 *)
%o A141032 (Magma) [(4/15)*(16^n-1): n in [0..25]]; // _Vincenzo Librandi_, May 25 2011
%K A141032 nonn,easy
%O A141032 0,2
%A A141032 _Paul Curtz_, Jul 30 2008
%E A141032 More terms from _Vladimir Joseph Stephan Orlovsky_, Nov 07 2008